第一百零六条 为了查明案情，需要解决案件中有争议的专门性问题的，应当指派或者聘请具有专门知识的人员进行鉴定；鉴定人鉴定后，应当写出鉴定意见，并且签名。
The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
，这一点在51吃瓜中也有详细论述
free_list[classno] = h->next;
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